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qUESTIONS

In the circuit shown below, the power developed in the 6Ω resistor is 6 watt. The power in watts developed in the 4Ω resistor is

If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be

An electric bulb rated 220 V, 100 W is connected in series with another bulb rated 220 V, 60 W. If the voltage across the combination is 220 V, the power consumed by the 100 W bulb will be about

Ten identical cells connected in series are needed to heat a wire of length one meter and radius ‘r’ by 10° C in time ‘t’. How many cells will be required to heat the wire of length two meter of the same radius by the same temperature in time ‘t’

Two wires A and B of same material and mass have their lengths in the ratio 1: 2. On connecting them to the same source, the rate of heat dissipation in B is found to be 5W. The rate of heat dissipation in A is

In the circuit element given here, if the potential at point B, VB = 0, then the potentials of A and D are given as

A cell of e.m.f. E is connected with an external resistance R, then p.d. across cell is V. The internal resistance of cell will be

Two batteries of e.m.f. 4 V and 8 V with internal resistances 1Ω and 2Ω are connected in a circuit with a resistance of 9Ω as shown in figure. The current and potential difference between the points P and Q are

A battery of emf 8 V with internal resistance 0.5Ω is being charged by a 120 V d.c. supply using a series resistance of 15.5Ω. The terminal voltage of the battery is

In the circuit given here, the points A, B and C are 70 V, zero, 10 V respectively. Then

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